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Yealink Model #s EHS 40 is compatible with: SIP VP59, T58A, T57W, T53W, T54W, T53, T48S, T46S, T42S, T41S
PLEASE NOTE #1: If an expansion module has been connected to the SIP- T58A, T57W, T54W, T53W, or T43 IP phone, you can connect the EHS40 to the expansion module
Sennheiser: Grab the adapter box, and the Sennheiser Y-cord (top of the y-cord has an RJ45 and RJ9 connection, the bottom of the y-cord has an RJ45 connection)
What is in the box: Yealink adapter box that has a USB cord coming out of it, 1 Sennhieser Y-cord, 1 Plantronics Y-cord, and 1 Jabra Y-cord.
1) Connect the bottom of the y-cord into the green PHONE port in the back of the cube
2) Connect RJ45 and RJ9 end of the y-cord into the 2 available slots in the Yealink adapter box
3) Plug the USB cord coming out of the adapter box into the USB port in the phone
4) Move D/S #1 down (bottom right in back of cube) and ABC switch on A
Does not immediately give ring detection. To get it to work correctly, you will need to get to the web portal and do the following:
Please go to phone web portal > Features > Audio > Ringer Device for Headset, then choose Use Headset & Speaker. The below picture for your reference.